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Fair Values of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | $ 1,169,328 |
Estimated Fair Value | 1,297,203 |  | 1,171,303 |
Other investments | 28,357 |  | 28,228 |
Loans Held for Sale |  |  | 0 |
Other Assets |  |  | 16,480 |
Total Assets |  |  | 1,216,011 |
Other Liabilities |  |  | 18,726 | [1]
Total Liabilities |  |  | 18,726 |
Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Estimated Fair Value |  |  | 1,975 |
Total Assets | 1,420 |  |  |
US Government Agencies Debt Securities [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | 31,664 |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | 864,401 |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | 149 |
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | 242,664 |
Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | 86 |
Corporate securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | 6,991 |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities |  |  | 23,373 |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Estimated Fair Value | 513 |  | 555 |
Other investments | 0 |  | 0 |
Loans Held for Sale |  |  | 0 |
Other Assets | 0 |  | 0 |
Total Assets | 513 |  | 555 |
Other Liabilities | 0 | [1] | 0 | [1]
Total Liabilities | 0 |  | 0 |
Level 1 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Estimated Fair Value | 513 |  | 555 |
Level 1 [Member] | US Government Agencies Debt Securities [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 1 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 1 [Member] | Corporate securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 1 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 1,270,758 |  | 1,145,955 |
Estimated Fair Value | 1,270,758 |  | 1,145,955 |
Other investments | 28,357 |  | 28,228 |
Loans Held for Sale |  |  | 0 |
Other Assets | 16,763 |  | 16,480 |
Total Assets | 1,315,878 |  | 1,190,663 |
Other Liabilities | 17,086 | [1] | 18,726 | [1]
Total Liabilities | 17,086 |  | 18,726 |
Level 2 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Estimated Fair Value | 0 |  | 0 |
Level 2 [Member] | US Government Agencies Debt Securities [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 30,462 |  | 31,664 |
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 990,660 |  | 864,401 |
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 140 |  | 149 |
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 242,438 |  | 242,664 |
Level 2 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 85 |  | 86 |
Level 2 [Member] | Corporate securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 6,973 |  | 6,991 |
Level 2 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 24,512 |  | 23,373 |
Estimated Fair Value | 25,932 |  | 24,793 |
Other investments | 0 |  | 0 |
Loans Held for Sale |  |  | 0 |
Other Assets | 0 |  | 0 |
Total Assets | 25,932 |  | 24,793 |
Other Liabilities | 0 | [1] | 0 | [1]
Total Liabilities | 0 |  | 0 |
Level 3 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Estimated Fair Value | 1,420 |  | 1,420 |
Level 3 [Member] | US Government Agencies Debt Securities [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 3 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 3 [Member] | Corporate securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 0 |  | 0 |
Level 3 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 24,512 |  | 23,373 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 1,295,270 |  |  |
Estimated Fair Value | 1,297,203 |  |  |
Other investments | 28,357 |  |  |
Other Assets | 16,763 |  |  |
Total Assets | 1,342,323 |  |  |
Other Liabilities | 17,086 | [1] |  |
Total Liabilities | 17,086 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Estimated Fair Value | 1,933 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Agencies Debt Securities [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 30,462 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 990,660 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage Backed Securities Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 140 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 242,438 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 85 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | 6,973 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Debt Securities | $ 24,512 |  |  |
[1] | Non-hedging interest rate derivatives

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 26 -IssueDate 2006-05-01 -Chapter 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of assets categorized as other which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of liabilities categorized as other which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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